Out-of-box ESM, TypeScript and JSX support powered by esbuild. Vitest is free and open source, made possible by wonderful sponsors. Released under the MIT License.

Vite 's config, transformers, resolvers, and plugins. Use the same setup from your app! Smart & instant watch mode, like HMR for tests! Native code coverage via v8 or istanbul. Tinyspy built-in for …

Feb 25, 2025 · Learn how to use Vitest, a fast JavaScript testing framework. This guide covers project setup, writing tests, filtering, mocking, hooks, code coverage, and the Vitest UI.

Dec 18, 2025 · Vitest is a powerful testing library built on top of Vite that has exploded in popularity since its initial release. You can use Vitest for a range of testing needs, such as unit, integration, end-to …

Aug 27, 2024 · In the React ecosystem, tools like Vitest offer a fast, powerful, and easy-to-use testing framework that integrates seamlessly with modern React applications. In this post, we’ll explore how …

Vitest (pronounced as "veetest") is a next generation testing framework powered by Vite. You can learn more about the rationale behind the project in the Why Vitest section. You can try Vitest online on …

Jun 27, 2025 · Vitest is a modern JavaScript unit testing framework designed as a native companion to Vite, the popular build tool. Created to complement Vite, a tool for helping to manage and build …

Next generation testing framework powered by Vite.

To configure vitest itself, add test property in your Vite config. You'll also need to add a reference to Vitest types using a triple slash command at the top of your config file, if you are importing …

Jan 17, 2025 · Vitest 3 introduces a more performant way to run your browser tests in different browsers or setups. Instead of using the workspace, you can define an array of instances to run your browser …